21796207 has 2 divisors, whose sum is σ = 21796208. Its totient is φ = 21796206.

The previous prime is 21796199. The next prime is 21796217. The reversal of 21796207 is 70269712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21796207 - 2³ = 21796199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21796217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10898103 + 10898104.

It is an arithmetic number, because the mean of its divisors is an integer number (10898104).

Almost surely, 2^21796207 is an apocalyptic number.

21796207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21796207 is an equidigital number, since it uses as much as digits as its factorization.

21796207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 21796207 is about 4668.6408086294. The cubic root of 21796207 is about 279.3360416092.

The spelling of 21796207 in words is "twenty-one million, seven hundred ninety-six thousand, two hundred seven".